This is a very interesting thread for me. I am also grateful for Spero's contribution as a lawyer.
My experience has been very negative. Like Spero, I should never have had a child with my ex. I was in my 40's and he is autistic (as I believe my ex is). We had a long marriage. He walked out and cut us off completely in every way. Within a few days I had discovered that he had sacked me from our business (illegally and against the advice of the accountant), he had removed his name from all the utilities, cancelled the burglar alarm contract, stolen money from the children by selling their shares, cancelled mobile phone contracts (even my DS's, she was 14). He stopped paying the mortgage. He told me I would be going on benefits as his solicitor advised "that was best". He ran up a huge directors loan entertaining OW and doing alterations to her property, he had flying lessons. I could go on and on. I made huge sacrifices in terms of my career and freedom for this twat and he totally totally abandoned us. He has since halved child maintenance as he uses it as a weapon against me rather than considering the needs of his son.
I self repped in court. Won 100% of the marital assets and a nominal order. Managed to get OW in court too. The lengths they went to were astonishing and they were treated with contempt by the court. We are nearly 2 years down the line and it's still ongoing and I am still not divorced. I managed to file for divorce on the grounds of his adultery, taking the petition to court myself and handing it over after I received an utterly astonishing petition via his solicitor for my "unreasonable behaviour". I was threatened by OW and her solicitors for daring to implicate her! 
The emotional fallout has been huge. I am struggling to recover and know that this has changed me irrevocably. The man I fell in love with didn't exist. He and OW continue to make my lives a misery day in and day out. My children are deeply affected and we are fearful for our future. We have had social services and police involvement and my children and OW's DS are subject to a MARAC referral. It has been utterly horrific.
If I could rewind, I would have jumped on the finances immediately. I would have immediately sought help from the court, as it was I wasn't ready to do that for a year. I would have done everything differently and cut him off there and then and gone NC. Our relationship will never recover from this, we will never be able to co-parent and I will have to move to get away from him.
I am sorry to sound so negative, but to the OP please bear this in mind that Mr Reasonable can suddenly become Mr Horror Story within a few short days. I wish you lots of luck and a peaceful divorce, it's so tough, it really is 